3.MD.C. Geometric measurement: understand concepts of area and relate area to multiplication and to addition.
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3.MD.C.5. Recognize area as an attribute of plane figures and understand concepts of area measurement.
3.MD.C.5.a. A square with side length 1 unit, called “a unit square,” is said to have “one square unit” of area, and can be used to measure area.
3.MD.C.5.b. A plane figure which can be covered without gaps or overlaps by $n$ unit squares is said to have an area of $n$ square units.
3.MD.C.6. Measure areas by counting unit squares (square cm, square m, square in, square ft, and improvised units).
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